HEAPU8 and _malloc

[yjjnls]

According to some examples, I found that Module._malloc() return the address of the alloced memory, something like the pointer.

But in the example below:

let data = new Uint8Array([0, 0, 0, 255, 0, 1, 2, 3]);
let dataPtr = cv._malloc(8);
let dataHeap = new Uint8Array(cv.HEAPU8.buffer, dataPtr, 8);

new Uint8Array(buffer [, byteOffset [, length]]);

byteOffset should be the offset in the buffer, but here dataPtr is passed in.

I don't know why?

According to the doc, byteOffset is the offset (in bytes) of the Uint8Array from the start of its ArrayBuffer. But what cv._malloc(8) returned is an address. The former is a relative address, the latter is an absolute address. I think they're different.

The example is from opencv.js, and it run correctly.

[kripken]

This stuff can be confusing, yeah. But HEAPU8.buffer is all of memory, so an offset on it is the same as an absolute offset.

[stale]

This issue has been automatically marked as stale because there has been no activity in the past year. It will be closed automatically if no further activity occurs in the next 7 days. Feel free to re-open at any time if this issue is still relevant.